Possible Clues:

• Excellence as a virtue, to ancient Greeks
• Mountain ridge (EATER anagram)
• Tricky part of climb, perhaps, needing some spare tents
• Formation from glaciation
• Alpine ridge needs some spare tents
• Any ridge of 16-Across
• High point to visit regularly in fair weather
• Russell comes around about for tea on Blue Ridge Mountains of Virginia perhaps
• Narrow mountain ridge — eater (anag)
• Knife-edged mountain ridge between glacial valleys